/Engine/Plugins/Runtime/nDisplay/Source/DisplayClusterProjection/Public/DisplayClusterProjectionStrings.h
The VIOSO calibration file contains several instances of geometry (for several screens in one file), so we must use this parameter to be able to select the right one.
namespace DisplayClusterProjectionStrings { namespace cfg { namespace VIOSO { static constexpr const TCHAR * DisplayClusterProjectionStrings::cfg::VIOSO::CalibIndex = TEXT("index"); } } }